Apple (AAPL) was hot and Microsoft (MSFT) was not on Black Friday and the opening weekend of the holiday shopping season, according to retail checks by several analysts. Traffic at Apple stores in Minneapolis was up 31% on Black Friday vs. a year ago, likely driven by shoppers wanting to see the iPad Mini, Piper Jaffray analyst Gene Munster said in a research note Monday. But the most popular model of Apple's new 7.9-inch tablet, the iPad Mini